ANTENNA DEVICE AND WIRELESS COMMUNICATION DEVICE

Abstract

An antenna device comprises a plate-shaped mass section having a through-hole, a plate-shaped antenna element arranged inside the through-hole and having a length corresponding to half a wavelength of a radio wave with a first frequency, and a waveguide element arranged in a radiation direction so that the antenna element can radiate the radio wave, and arranged such that, viewed in the radiation direction, it overlaps at least partially with one end of the antenna element in the longitudinal direction of the antenna element, wherein the waveguide element has a size corresponding to 0.1 to 0.38 times the wavelength of the radio wave.

Description

TECHNICAL AREA

[0001] The present invention relates to an antenna device and a wireless communication device. TECHNICAL BACKGROUND

[0002] To support the widespread use of wireless communication technology, various innovations in the field of antennas have been implemented. For example, a folded slotted antenna has been proposed, suitable for omnidirectional antennas as well as for antennas integrated into motor vehicles (see, e.g., patent documents 1 to 3). [QUOTATION LIST][Patent Literature] [Patent Document 1] Japanese Patent Publication No. 2012-49865 [Patent document 2] Japanese patent publication no. H11-55025 [Patent document 3] Japanese patent publication no. H06-283923 [SUMMARY OF THE INVENTION][TECHNICAL PROBLEM]

[0003] A technique is used to determine the spatial position of a device comprising a plurality of antennas using radio waves emitted by these multiple antennas. With this technique, the accuracy of the position detection decreases if the phases of the radio waves emitted by the plurality of antennas do not match with respect to an azimuth angle or an elevation angle (if the phases fluctuate).

[0004] One aspect of a disclosed technique is to provide an antenna device and a wireless communication device that can reduce phase variations with respect to a radiation angle of a radio wave to be radiated or an arrival angle of a radio wave to be received. [SOLUTION TO THE PROBLEM]

[0005] The aspect of the disclosed technique relates, for example, to the following antenna device. This antenna device comprises: a plate-shaped ground section having a through-hole; a plate-shaped antenna element arranged inside the through-hole and having a length corresponding to half a wavelength of a radio wave with a first frequency; and a waveguide element arranged in a radiation direction so that the antenna element can radiate the radio wave, and arranged such that, viewed in the radiation direction, it overlaps at least partially with one end of the antenna element along the longitudinal direction of the antenna element. The waveguide element has a size corresponding to 0.1 to 0.38 times the wavelength of the radio wave. [BENEFICIAL EFFECTS OF THE INVENTION]

[0006] According to the disclosed technique, variations in the phases with respect to a radiation angle of a radio wave to be emitted or a radio wave to be received can be reduced. [BRIEF DESCRIPTION OF THE DRAWINGS] [ Fig. 1] Fig. Figure 1 is a perspective view showing an example of an antenna device according to one embodiment. [ Fig. 2] Fig. Figure 2 is a diagram showing an antenna element in the Z direction. [ Fig. 3] Fig. Figure 3 is a diagram showing the antenna device in the X direction. [ Fig. 4] Fig. Figure 4 is a diagram showing the antenna arrangement in the Z direction. [ Fig. 5] Fig. Figure 5 is a first graphical representation showing a result of the first simulation. [ Fig. 6] Fig. Figure 6 is a second graphical representation showing a result of the first simulation. [ Fig. 7] Fig. Figure 7 is a third graphical representation showing a result of the first simulation. [ Fig. 8] Fig. Figure 8 is a diagram that illustrates an example of a sleeve antenna according to comparison example 1. [ Fig. 9] Fig. Figure 9 is a first graphical representation showing a result of the second simulation. [ Fig. 10] Fig. Figure 10 is a second graphical representation showing a result of the second simulation. [ Fig. 11] Fig. Figure 11 is a graphical representation showing a result of the second simulation. [ Fig. 12] Fig. Figure 12 is a diagram illustrating an example of a folded slotted antenna according to comparison example 2. [ Fig. 13] Fig. Figure 13 is a first graphical representation showing a result of the third simulation. [ Fig. 14] Fig. Figure 14 is a second graphical representation showing a result of the third simulation. [ Fig. 15] Fig. Figure 15 is a third graphical representation showing a result of the third simulation. [ Fig. 16] Fig. Figure 16 is a diagram that shows an example of an antenna device used for the fourth simulation. [ Fig. 17] Fig. Figure 17 is a first graphical representation showing a result of the fourth simulation. [ Fig. 18] Fig. Figure 18 is a second graphical representation showing a result of the fourth simulation. [ Fig. 19] Fig. Figure 19 is a third graphical representation showing a result of the fourth simulation. [ Fig. 20] Fig. Figure 20 is a first graphical representation showing a result of the fifth simulation. [ Fig. 21] Fig. Figure 21 is a second graphical representation showing a result of the fifth simulation. [ Fig. 22] Fig. Figure 22 is a third graphical representation showing a result of the fifth simulation. [ Fig. 23] Fig. Figure 23 is a first graphical representation showing a result of the sixth simulation. [ Fig. 24] Fig. Figure 24 is a second graphical representation showing a result of the sixth simulation. [ Fig. 25] Fig. Figure 25 is a third graphical representation showing a result of the sixth simulation. [ Fig. 26] Fig. Figure 26 is a first graphical representation showing a result of the seventh simulation. [ Fig. 27] Fig. Figure 27 is a second graphical representation showing a result of the seventh simulation. [ Fig. 28] Fig. Figure 28 is a third graphical representation showing a result of the seventh simulation. [ Fig. 29] Fig. Figure 29 is a first schematic diagram representing an electric field visualized in the eighth simulation. [ Fig. 30] Fig. Figure 30 is a second schematic diagram representing an electric field visualized in the eighth simulation. [ Fig. 31] Fig. Figure 31 is a third schematic diagram representing an electric field visualized in the eighth simulation. [ Fig. 32] Fig. Figure 32 is an exterior view, representing an example of a smartphone. [ Fig. 33] Fig. Figure 33 is a diagram that shows an example of an antenna device containing circular waveguide elements. [ Fig. 34] Fig. Figure 34 is a diagram illustrating an example of an antenna device containing rectangular frame-shaped waveguide elements. [ Fig. 35] Fig. Figure 35 is a diagram that presents an example of an antenna device in which a ground section, an antenna element and waveguide elements are arranged on a dielectric substrate. [DESCRIPTION OF EXECUTION FORMS]<Ausführungsform>

[0007] One embodiment is described with reference to the drawings. Fig. Figure 1 is a perspective view showing an example of an antenna device 1 according to the embodiment. The antenna device 1 comprises a grounding section 10, an antenna element 20, waveguide elements 31 and 32, and a feed point 40. Fig. 1 the X-direction is a width direction of the mass section 10, the Y-direction is a height direction of the mass section 10 and the Z-direction is a direction from the mass section 10 to the waveguide elements 31 and 32.

[0008] The ground plane 10, the antenna element 20, and the waveguide elements 31 and 32 are, for example, formed from metal plates. The ground plane 10 is rectangular in the Z-direction (the direction in which the antenna element 20 radiates the radio wave). A through-hole 11 is formed in the ground plane 10, penetrating it in the thickness direction (Z-direction). The antenna element 20 is located in the through-hole 11. The ground plane 10 is an example of a "ground plane." The through-hole 11 is an example of a "through-hole."

[0009] For example, the antenna element 20 has a rectangular shape when viewed in the Z direction. Fig. Figure 2 shows a view of antenna element 20 in the Z direction. Fig. Figure 2 also illustrates the ground loop 10. The antenna element 20 is longer in the Y direction and shorter in the X direction. The length L1 of the antenna element 20 in the longer direction is, for example, the length corresponding to half a wavelength of the frequency of the radio wave radiated by the antenna element 20. The antenna element 20 is, for example, in the shape of a rectangle whose length in the longer direction is, for example, L1. The antenna element 20 is arranged inside the through-hole 11 such that it does not come into contact with the ground loop 10. In other words, a gap is formed inside the through-hole 11 between the ground loop 10 and the antenna element 20. The antenna element 20 is connected to the feed point 40 at its center in its longer direction. The antenna element 20 receives power via the feed point 40 and emits radio waves in the Z direction.In other words, antenna element 20 is a feed element. The radio wave emitted by antenna element 20 is, for example, a radio wave used for the fifth generation of mobile communications (5G). In this description, λ denotes the wavelength of the radio wave emitted by antenna element 20. Antenna element 20 is an example of an "antenna element." The frequency of the radio wave emitted by antenna element 20 is an example of a "first frequency."

[0010] Waveguide elements 31 and 32 are arranged in the radiation direction of the antenna element 20. Each waveguide element 31 and 32 is rectangular when viewed, for example, in the Z-direction. Waveguide elements 31 and 32 are arranged side by side in the Y-direction. Fig. Figure 3 shows a view of the antenna device 1 in the X direction. The waveguide elements 31 and 32 are arranged at positions spaced apart from the ground plane 10 by a distance D1. In other words, the waveguide elements 31 and 32 are not in contact with the ground plane 10 or the antenna element 20. The waveguide elements 31 and 32 are not in contact with each other. The distance between the waveguide elements 31 and 32 is, for example, at least 42 mm (0.12 λ). The waveguide elements 31 and 32 are examples of a "first waveguide element" and a "second waveguide element".

[0011] Fig. Figure 4 shows a view of the antenna device 1 in the Z-direction. Fig. Figure 4 shows waveguide elements 31 and 32 as transparent, so that the ground section 10 and the antenna element 20, which are arranged behind these waveguide elements, are visible. The waveguide elements 31 and 32 are arranged such that, viewed in the Z direction, they overlap with the ends 21 and 22 of the antenna element 20 in the longer direction. Each of the waveguide elements 31 and 32 is, for example, formed in the shape of a square, the length of one side of which, viewed in the Z direction, is L3. In other words, the horizontal width W3 and the vertical width L3 can have the same value. Each of the waveguide elements 31 and 32 can also be formed in the shape of a rectangle, viewed in the Z direction. In other words, the horizontal width W3 and the vertical width L3 can have different values. The ground section 10 is formed in the shape of a square, the side length of which is L2.The mass section 10 can be formed in a shape other than a square (e.g., in the form of a rectangle).

[0012] The properties of the antenna device 1 according to this embodiment were simulated (first simulation), which is described with reference to the drawings. In the first simulation described below, the length L2 of one side of the ground section 10 is set to 200 mm, the length L1 of the antenna element 20 in the longer direction is set to 166 mm, and the length L3 of one side of the waveguide elements 31 and 32 is set to 70 mm. The distance D1 between the ground section 10 and the waveguide elements 31 and 32 is set to 15 mm.

[0013] Fig. Figures 5 to 7 are graphical representations depicting the result of the first simulation. Fig. 5A represents an enhancement in the XY plane. Fig. 5B is a phase represented in the XY plane. Fig. 6A represents a gain in the ZX plane. Fig. 6B is a phase represented in the ZX plane. Fig. 7A represents a gain in the YZ plane. Fig. 7B is a phase represented in the YZ plane.

[0014] A range in which at least a gain of -10 dBi is achieved is considered the communicable range, and the maximum value of the phase difference within the communicable range is taken into account. In the following description, the difference between the largest and smallest phases within the communicable range is considered the phase difference in the XY, ZX, and YZ planes, respectively. Fig. 5. The phase difference in the XY plane is a maximum of 15°. According to Fig. 6. The phase difference in the ZX plane is a maximum of 8°. According to Fig. 7. The phase difference in the YZ plane is a maximum of 3°. <Vergleichsbeispiel 1 >

[0015] A comparative example will now be described. Fig. Figure 8 is a diagram illustrating an example of a sleeve antenna 800 according to Comparative Example 1. The sleeve antenna 800 comprises an antenna element 801, a sleeve 802, a main body 803, and a feed point 840. The main body 803 houses a power supply, a signal processing circuit, and the like. In the sleeve antenna 800, the linearly shaped antenna element 801 is connected to the feed point 840, which is located at the top of the sleeve 802.

[0016] The properties of the sleeve antenna 800 according to comparison example 1 were simulated (second simulation), which is described with reference to the drawings. Fig. Figures 9 to 11 are graphical representations depicting the result of the second simulation. Fig. 9A represents an enhancement in the XY plane. Fig. 9B is a phase represented in the XY plane. Fig. 10A represents a gain in the ZX plane. Fig. 10B is a phase represented in the ZX plane. Fig. 11A represents a gain in the YZ plane. Fig. 11B is a phase represented in the YZ plane.

[0017] It is assumed that a range in which a gain of at least -10 dBi is achieved is a communicable range, and the maximum value of the phase difference in the communicable range is taken into account. According to Fig. 9. The phase difference in the XY plane is a maximum of 29°. According to Fig. 10 The phase difference in the ZX plane is a maximum of 50°. According to Fig. 11. The phase difference in the YZ plane is a maximum of 59°. <Vergleichsbeispiel 2>

[0018] Fig. Figure 12 is a diagram illustrating an example of a folded slot antenna 900 according to Comparative Example 2. The folded slot antenna 900 comprises a ground section 910, an antenna element 920, and an antenna element 920. A through-hole 911 is arranged in the ground section 910. The antenna element 920 is located inside the through-hole 911 and radiates radio waves, receiving power supplied from a feed point 940. The folded slot antenna 900 according to Comparative Example 2 is the antenna device 1 according to the embodiment in which the waveguide elements 31 and 32 are removed.

[0019] The properties of the folded slotted antenna 900 according to comparison example 2 were simulated (third simulation), which is described with reference to the drawings. Fig. Figures 13 to 15 are graphical representations depicting the result of the third simulation. Fig. 13A represents an enhancement in the XY plane. Fig. 13B is a phase represented in the XY plane. In Fig. 14A represents a gain in the ZX plane. Fig. 14B is a phase represented in the ZX plane. Fig. 15A represents a gain in the YZ plane. Fig. 15B is a phase represented in the YZ plane.

[0020] A range in which a gain of at least -10 dBi is achieved is considered a communicable range, and the maximum value of the phase difference within the communicable range is taken into account. According to Fig. 13. The phase difference in the XY plane is a maximum of 12°. According to Fig. 14. The phase difference in the ZX plane is a maximum of 8°. According to Fig. 15 The phase difference in the YZ phase is a maximum of 18°. <Verifizierung der Ausführungsform und Vergleichsbeispiele>

[0021] Considering the results of the first to third simulations, the phase difference generated in the antenna device 1 according to the embodiment is smaller in the XY, ZX, and YZ planes than that of the sleeve antenna 800 and the folded slot antenna 900. The phase differences in the ZX and YZ planes, which are the main radiation directions, were improved in the antenna device 1 compared to the sleeve antenna 800 and the folded slot antenna 900. In other words, when the antenna device 1 is used according to the embodiment, radio waves can be emitted with small phase differences in the main radiation directions. <Untersuchung von Variationen>

[0022] Each size of the antenna device 1 with these properties and the positions of the waveguide elements 31 and 32 were investigated, and the result is described below. First, a fourth simulation for investigating the position of the waveguide element 31 is described. Fig. Figure 16 is a diagram illustrating an example of antenna device 1A used for the fourth simulation. Antenna device 1A is antenna device 1 with the waveguide element 32 removed. In the fourth simulation, the waveguide element 31 is moved 120 mm in the +Y direction from a position where the center of the waveguide element 31 and the feed point 40 coincide when viewed in the Z direction, and the phase difference is then checked.

[0023] Fig. Figures 17 to 19 are graphical representations depicting the result of the fourth simulation. Fig. Figure 17A shows an enhancement in the XY plane. Fig. 17B is a phase represented in the XY plane. Fig. 18A represents a gain in the ZX plane. Fig. 18B is a phase represented in the ZX plane. Fig. Figure 19A shows a gain in the YZ plane. Fig. 19B represents a phase in the YZ plane. Fig. Figures 17 to 19 show the gain and phase difference for displacement distances of 0 mm, 30 mm, 60 mm, 90 mm and 120 mm of the waveguide element 31.

[0024] According to Fig. In sections 17 to 19, the phase difference is improved by shifting the waveguide element 31 in the +Y direction, compared to the state in which the center of the waveguide element 31 and the feed point 40 overlap when viewed in the Z direction (displacement distance: 0 mm). In other words, to improve the phase difference, it is preferred that the waveguide element 31 and the end 21 of the antenna element 20 overlap when viewed in the Z direction. To further improve the phase difference, it is preferred that the center of the waveguide element 31 and the end 21 of the antenna element 20 overlap when viewed in the Z direction (displacement distance: 120 mm).

[0025] Now a fifth simulation will be performed to investigate a distance D1 (see Fig. 3) between the waveguide elements 31 and 32 and the ground section 10. In the fifth simulation, fluctuations in gain and phase were checked while the distance D1 was varied. Fig. Figures 20 to 22 are graphical representations showing the result of the fifth simulation. Fig. 20A shows an amplification in the XY plane. Fig. 20B shows a phase in the XY plane. Fig. 21A shows a gain in the ZX plane. Fig. 21B shows a phase in the ZX plane. Fig. 22A shows a gain in the YZ plane. Fig. 21B shows a phase in the YZ plane. Fig. Figures 20 to 22 show the gain and phase for the distance D1 of 5 mm, 30 mm, 55 mm, 80 mm, 105 mm, 130 mm, 155 mm, 180 mm and 200 mm respectively.

[0026] According to Fig. 20 to 22 The phase difference improves as the distance D1 between the waveguide elements 31 and 32 decreases. The distance D1 is preferably 30 mm or less (0.09 λ or less), and more preferably 5 mm (0.015 λ) or less.

[0027] Now a sixth simulation will be performed to investigate the horizontal width W3 (see Fig. The waveguide elements 31 and 32 are described. In the sixth simulation, variations in gain and phase difference were examined while the horizontal width W3 of waveguide elements 31 and 32 was varied. In the sixth simulation, the vertical width L3 is set to 70 mm, and the spacing D1 is set to 15 mm.

[0028] Fig. Figures 23 to 25 are graphical representations depicting the result of the sixth simulation. Fig. 23A represents an enhancement in the XY plane. Fig. 23B is a phase represented in the XY plane. In Fig. 24A represents a gain in the ZX plane. Fig. 24B is a phase represented in the ZX plane. Fig. 25A represents a gain in the YZ plane. Fig. 25B is a phase represented in the YZ plane. Fig. Figures 23 to 25 show the gain and the phase for the horizontal width W3 of 5 mm, 20 mm, 35 mm, 50 mm, 65 mm, 80 mm, 95 mm, 110 mm, 125 mm and 140 mm respectively.

[0029] To improve the phase difference, it is according to Fig. References 23 to 25 preferably state that the horizontal width W3 is at least 50 mm and not more than 80 mm. In other words, it is preferred that the horizontal width W3 in a direction that intersects the antenna element 20 in its longer direction is at least 0.1 λ and not more than 0.38 λ. To further improve the phase difference, it is preferred that the horizontal width W3 be approximately 70 mm.

[0030] Now a seventh simulation will be performed to investigate the vertical width L33 (see Fig. 4) of the waveguide elements 31 and 32 are described. In the seventh simulation, variations in gain and phase were checked while the vertical width L33 of the waveguide elements 31 and 32 was changed differently. In the seventh simulation, the horizontal width W3 is set to 70 mm, and the spacing D1 is set to 15 mm.

[0031] Fig. Figures 26 to 28 are graphical representations depicting the result of the seventh simulation. Fig. 26A shows an enhancement in the XY plane. Fig. 26B is a phase represented in the XY plane. Fig. 27A shows a gain in the ZX plane. Fig. Figure 27B shows a phase difference in the ZX plane. Fig. 28A represents a gain in the YZ plane. Fig. Figure 28B shows a phase difference in the YZ plane. Fig. Figures 26 to 28 show the gain and phase difference for the vertical width L3 of 20 mm, 35 mm, 50 mm, 65 mm, 80 mm, 95 mm, 110 mm, 125 mm and 140 mm respectively.

[0032] To improve the phase difference, it is according to Fig. 26 to 28, preferably the vertical width L3 is at least 35 mm (0.1 λ) and not more than 95 mm (0.38 λ). To further improve the phase difference, it is preferred that the vertical width L3 is approximately 70 mm.

[0033] An eighth simulation is now described to visualize an electric field radiated by antenna device 1. In this eighth simulation, the electric field is visualized for antenna device 1 with a vertical width L3 set to 70 mm, for antenna device 1 with a vertical width L3 set to 140 mm, and for the folded slotted antenna 900 according to comparison example 2.

[0034] Fig. Figure 29 is a first schematic diagram representing an electric field visualized in the eighth simulation. Fig. Figure 29 visualizes an electric field of a radio wave emitted by the antenna element 20 for the antenna device 1, whose vertical width L3 is set to 70 mm. An electric field E1 in Fig. Figure 29 schematically shows the entire electric field. Electric field E2 is a magnified view of a region of electric field E1 in the direction θ = 0°. Electric field E3 is a magnified view of electric field E1 in the direction θ = 90°. A curved line is also drawn in electric fields E2 and E3, indicating a position 1 m away from the feed point 40.

[0035] Fig. Figure 30 is a second schematic diagram representing an electric field visualized in the eighth simulation. Fig. Figure 30 visualizes an electric field of a radio wave emitted by the antenna element 20 for the antenna device 1, whose vertical width L3 is set to 140 mm. An electric field E11 in Fig. Figure 30 schematically shows an entire electric field. Electric field E12 is a magnified view of a region of electric field E11 in the direction θ = 0°. Electric field E13 is a magnified view of electric field E11 in the direction θ = 90°. In electric fields E12 and E13, a curved line is also shown, indicating a position 1 m away from the feed point 40.

[0036] Fig. Figure 31 is a third schematic diagram representing an electric field visualized in the eighth simulation. Fig. Figure 31 visualizes an electric field of a radio wave radiated by the antenna element 920 for the folded slot antenna 900 according to comparative example 2. An electric field E21 in Fig. Figure 31 schematically shows the entire electric field. Electric field E22 is a magnified view of a region of electric field E21 in the direction θ = 0°. Electric field E23 is a magnified view of electric field E21 in the direction θ = 90°. A curved line is also shown in electric fields E22 and E23, indicating a position 1 m away from the feed point 40.

[0037] When comparing Fig. 29 to 31 is located in Fig. 29, in which the antenna device 1 is simulated, whose vertical width L3 is set to 70 mm, the “1-m line” lies within a valley of the electric field at both “θ = 0°” and “θ = 90°”. On the other hand, in Fig. 30, in which the antenna device 1 is simulated, whose vertical width L3 is set to 140 mm, and in Fig. In diagram 31, where the folded slot antenna 900 is simulated, the "1-m line" lies within the valley of the electric field at "θ = 90°", but outside the valley of the electric field at "θ = 0°". This means that the antenna device 1, whose vertical width L3 is set to 70 mm, can reduce the phase difference more effectively than both the antenna device 1 with a vertical width L3 set to 70 mm and the folded slot antenna 900. This is likely because the waveguide elements 31 and 32, which adjusted the radiation timing of the radio wave and thereby shifted the position of the valley of the electric field, reduced the phase differences at "θ = 0°" and "θ = 90°".

[0038] The antenna device 1 described above can, for example, be installed in a smartphone. Fig. Figure 32 is an exterior view showing an example of a Smartphone 100. In Fig. The antenna devices 1, which are not visible from the outside, are shown by dashed lines. The smartphone 100 contains three antenna devices 1 inside its casing 110. Although Fig. Figure 32 illustrates the smartphone 100; however, the antenna device 1 can also be installed in other wireless communication devices besides the smartphone 100. Examples of such devices include a notebook PC, a tablet computer, a portable device, a base station, a drone, a basic mobile phone, and the like. <Effekte der Ausführungsform>

[0039] In the present embodiment, the antenna element 20 is arranged inside the through-hole 11 of the antenna device 1, and the waveguide elements 31 and 32 are arranged in the direction of radio wave radiation of the antenna element 20. The arrangement of the waveguide elements 31 and 32 adjusts the emission time of the radio wave and reduces the phase difference based on the direction of radiation. This effect is not limited to the emission of a radio wave by the antenna device 1, but also applies to the reception of a radio wave by the antenna device 1.

[0040] When the antenna device 1 is used according to the present embodiment, the phase difference is reduced, so that the position detection accuracy can be improved when detecting the position of the smartphone 100 using radio waves emitted by the three antenna devices 1 in the smartphone 100. For example, the position detection accuracy can be ± 1 cm when the antenna device 1 is used whose vertical width L3 is set to 70 mm. <modifikationen>

[0041] In the embodiment described above, the waveguide elements 31 and 32 are rectangular, but the shape of the waveguide elements 31 and 32 is not limited to a rectangle. Fig. Figure 33 is a diagram showing an example of an antenna device 1A comprising circular waveguide elements 31A and 32A. Fig. Figure 34 is a diagram illustrating an example of an antenna device 1B comprising rectangular frame-shaped waveguide elements 31B and 32B. As shown in Fig. 33 and Fig. As illustrated in Figure 34, various shapes of the waveguide elements 31 and 32 can be used. It is preferred that the diameter of the circular waveguide element 31A, 32A be at least 50 mm and not more than 80 mm (at least 0.1 λ and not more than 0.38 λ), for example, like the horizontal width W3. It is preferred that the length of the horizontal width W4 of the rectangular frame-shaped waveguide element 31B or 32B in a direction intersecting the longer direction of the antenna element 20 be at least 50 mm and not more than 80 mm (at least 0.1 λ and not more than 0.38 λ), for example, like the horizontal width W3.

[0042] Electronic components can be mounted, for example, on the ground plane 10, the antenna element 20, and the waveguide elements 31 and 32 of the antenna device 1. When the electronic components are mounted on the ground plane 10, the antenna element 20, and the waveguide elements 31 and 32, the space inside the housing 110 can be used effectively when the antenna device 1 is installed, for example, in the smartphone 100.

[0043] Furthermore, the mass section 10, the antenna element 20 and the waveguide elements 31 and 32 can be arranged on a dielectric substrate. Fig. Figure 35 is a diagram illustrating an example of an antenna device 1C in which the ground section 10, the antenna element 20, and the waveguide elements 31 and 32 are arranged on dielectric substrates B1 and B2. Fig. In the configuration 35, the ground plane 10 is arranged on the dielectric substrate B1, the dielectric substrate B2 is arranged on the ground plane 10, and the waveguide elements 31 and 32 are arranged on the dielectric substrate B2. When this configuration is used, the wavelength of the radio wave radiated by the antenna element 20 becomes an effective wavelength, which is influenced by the dielectric constant of the dielectric substrates B1 and B2.

[0044] A capacitor, an inductor, a switch, and the like can be arranged at the feed point 40. By arranging the capacitor, inductor, switch, and the like, the resonant frequency of the antenna element 20 can be adjusted, and the tuning becomes simpler.

[0045] The antenna device 1 according to the embodiment comprises two waveguide elements 31 and 32, however, the number of waveguide elements included in the antenna device 1 can be one, three or more.

[0046] The embodiments and modifications disclosed above can be combined with one another. [DESCRIPTION OF REFERENCE MARKS] 1

[0049] Antenna device 1A Antenna device 1B Antenna device 1C Antenna Device 10 round section 11 Through hole 20 antenna elements 21 End 22 End 31 Waveguide element 32 Waveguide element 40 Feed-in point 100 smartphones 110 cases 800 sleeve antenna 801 Antenna element 802 Sleeve 803 Main body 840 Feed-in point 900 folded slotted antenna 910 Mass section 911 Through hole 920 antenna element 940 Feed-in point B1 dielectric substrate B2 dielectric substrate QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2012-49865

[0002] JP 11-55025

[0002] JP 06-283923

[0002] < / modifikationen>

Claims

[1] Antenna device comprising: a mass section formed in plate form, which has a through hole; an antenna element in the form of a plate, arranged inside the through-hole and having a length corresponding to half a wavelength of a radio wave with a first frequency; and a waveguide element arranged in a radiation direction so that the antenna element can radiate the radio wave, and arranged in such a way that, viewed in the radiation direction, it overlaps at least partially with one end of the antenna element in the longitudinal direction of the antenna element, where The waveguide element has a size that corresponds to 0.1 to 0.38 times the wavelength of the radio wave. [2] Antenna device according to claim 1, wherein the waveguide element is arranged such that, viewed in the direction of radiation, the center of the waveguide element and the end of the antenna element overlap in the longitudinal direction. [3] Antenna device according to claim 1, wherein a feed point is connected to a center of the antenna element in the longitudinal direction. [4] Antenna device according to claim 1, wherein the waveguide element is rectangular when viewed in the direction of radiation, and a length of one side of the waveguide element in a direction that intersects the antenna element, is a length that corresponds to 0.1 to 0.38 times the first frequency. [5] Antenna device according to claim 1, wherein the waveguide element is circular when viewed in the direction of radiation, and a length of the diameter of the waveguide element is a length that corresponds to 0.1 to 0.38 times the first frequency. [6] Antenna device according to claim 1, wherein the waveguide element is formed in a rectangular frame shape, and the length of one side of the waveguide element in a direction that intersects the antenna element is a length corresponding to 0.1 to 0.38 times the first frequency. [7] Antenna device according to claim 1, wherein the distance between the waveguide element and the antenna element is not more than 0.09 times the wavelength. [8] Antenna device according to claim 1, wherein the waveguide element comprises a first waveguide element and a second waveguide element, and the first waveguide element and the second waveguide element are arranged side by side along the longitudinal direction of the antenna element. [9] Antenna device according to claim 8, wherein the distance between the first waveguide element and the second waveguide element is at least 0.12 times the wavelength. [10] Wireless communication device comprising the antenna device according to any one of claims 1 to 9.

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